Load and freeze-thaw cycle coupled concrete durability testing device and evaluation method

A freeze-thaw cycle and test device technology, applied in measuring devices, using stable tension/pressure test materials, instruments, etc., can solve the problems of complex operation, inability to meet, difficult to popularize application, etc., to achieve convenient load application, The effect of ensuring accuracy and ensuring safety

Active Publication Date: 2018-01-05
CENT SOUTH UNIV +1
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  • Description
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  • Application Information

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Problems solved by technology

Liu Jiankun and others invented a soil freeze-thaw experimental system that can apply dynamic loads. The system is composed of a hydraulic system and a computer control system. By applying sinusoidal or square wave forces to soil samples, it can simulate the operation of high-speed trains under different conditions. To test the freezing characteristics of soil at different temperatures [the publication number is CN101699284A], but the main object of the device is frozen soil; Diao Bo et al. invented a load-bearing device for the freeze-thaw load coupling test of reinforced concrete beams [ The publication number is CN20161017U]. This device is relatively simple, mainly for large-scale specimens such as reinforced concrete beams, requires specific large-scale envir

Method used

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  • Load and freeze-thaw cycle coupled concrete durability testing device and evaluation method
  • Load and freeze-thaw cycle coupled concrete durability testing device and evaluation method
  • Load and freeze-thaw cycle coupled concrete durability testing device and evaluation method

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Experimental program
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Effect test

Embodiment 1

[0049] 1. Concrete is prepared, and the concrete components are configured according to the following mass ratios:

[0050] P.O42.5 ordinary silicon cement: mineral powder: water: medium sand: 5-25mm crushed stone: superplasticizer = 1:0.25:0.45:2.0:3.1:0.008, the design strength grade is C40, and the measured compressive strength is 47.6MPa, slump 160mm, gas content 3.0%

[0051] 2. The concrete cylinder specimen 7 (Ф50×150mm) to be tested and evaluated is prepared by using a steel mold, and the strain sensor 8 is carefully embedded in the concrete forming process, and then the mold is removed and maintained until the predetermined age.

[0052] 3. See figure 1 , Install and debug the load application device, and install two cylindrical concrete specimens 7 on a set of load application devices, and use a stainless steel backing plate with a diameter of 50mm and a thickness of 5mm to isolate the concrete cylinder specimens 7 ;

[0053] 4. Connect the lead wire of the sensor...

Embodiment 2

[0059] 1. Concrete is prepared, and the concrete components are configured according to the following mass ratios:

[0060]P.O42.5 ordinary silicon cement: mineral powder: fly ash: water: medium sand: 5-25mm gravel: superplasticizer = 1:0.20:0.15:0.45:1.9:3.1:0.008, design strength level C40 , the measured strength is 44.8MPa, the slump is 150mm, and the gas content is 3.5%.

[0061] 2. According to the steps 2 to 5 of Example 1, the mixed solution made of 5% sodium sulfate solution and 3.5% sodium chloride solution is used instead of water as the freeze-thaw medium, and the applied load of the concrete specimen is 40% of the ultimate load of the specimen. %, carry out the load and freeze-thaw coupling test of the specimen.

[0062] The concrete specimen of this embodiment was subjected to a freeze-thaw cycle coupling test under the condition that the applied load was 30% of its ultimate strength, and the critical value of failure of the concrete prepared in Example 1 was 200...

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Abstract

The invention discloses a load and freeze-thaw cycle coupled concrete durability testing device and an evaluation method. The device comprises a concrete load and freeze-thaw cycle coupling device, aconcrete strain testing system and a freeze-thaw testing machine. The concrete load and freeze-thaw cycle coupling device is placed in the freeze-thaw testing machine for a freeze-thaw cycle couplingtest. Sample strain data is recorded at real time through the concrete strain testing system, and by testing parameters such as rate of strain change, rate of mass change, etc. of a test piece after acertain times of load and freeze-thaw cycle coupling, durability of the concrete is evaluated. According to the invention, durability of loaded concrete (member) serving in severe cold areas can be rapidly tested, and load and freeze-thaw cycle coupling effect in actual service is accurately simulated. The method is simple to operate and is scientific and effective. The invention provides technical support for durability design and material selection of large-scale engineering structures under complex service conditions such as severe cold condition, etc.

Description

technical field [0001] The invention discloses a concrete durability test device and evaluation method under the coupling action of load and freeze-thaw cycle, in particular to a concrete durability test device under the coupling action of load and freeze-thaw cycle and concrete under the coupling action of load and freeze-thaw cycle The utility model relates to a durability evaluation method; it belongs to the technical field of concrete performance measurement. Background technique [0002] Since the birth of concrete materials, it has been the most widely used and used building material in the world. With the extension of service life and the continuous extension of engineering structures to harsh service environments such as severe cold and ocean, the durability of concrete materials and their structures has become one of the focuses in the field of concrete research. [Miao Changwen. Modern Concrete Theory and Technology [M ] Science Press, 2012.3.], and how to effectiv...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N25/00
Inventor 龙广成王旭杨振雄谢友均
Owner CENT SOUTH UNIV
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